[mpich-discuss] How to use non-blocking send/receive without calling MPI_Wait

[Dave Goodell (dgoodell)]

On Apr 3, 2015, at 4:55 PM, Jeff Hammond <jeff.science at gmail.com> wrote:

> MPI_Wait does not guarantee that the data sent with MPI_Isend is received.  It merely means you can reuse the send buffer.  If you want to be sure it has been received, use MPI_Issend (synchronous send).

MPI_Ssend or MPI_Issend completing only guarantees that the receiver has posted the matching receive, not that the data has been completely transferred to the receiver's buffer.

-Dave

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